While it was St. Patrick who drove the snakes out of Ireland, even he with his mighty staff cannot cast off the hangovers set to occur on Tuesday, March 18. Alas, St. Patrick’s Day falls on a Monday this year, and we can only imagine how many revelers will call in sick from work.

While sick day tallies elude our grasp, other numbers surrounding this mid-March holiday can be counted, and quite a few of them are green. The National Retail Federation forecasts that St. Paddy’s spending for 2014 should grow modestly to $4.8 billion, up slightly (about 2 percent) from last year. Talk about a heapin’ pot o’ gold.

So whether Irish green runs in your blood or simply down your Celtic sweater in the form of spilled St. Paddy’s beer, here’s our rundown on the stats, spending, and trivia surrounding St. Patrick’s Day.

St. Patrick’s Day spending: $35.75 per person

This NRF estimate is up about 50 cents from last year, and there’s any number of ways people will spend that money — whether it’s at grocery stores for corned beef or clothing stores for corny green sweaters.

Of course, the Irish make some of the most beautiful wool sweaters in the world, but something about this holiday brings out the Fooligan in many a reveler.

Millennials celebrating St. Patrick’s Day: 8 out of 10

You might think Patrick was the patron saint of those ages 18 to 24, as young adults in that range will honor the holiday in the largest numbers: 77 percent, according to the NRF forecast.

Parsing those numbers further, the NRF predicts that 90 percent will wear something green, though it’s hard to imagine what the other 10 percent will don instead.

Celebrants visiting restaurants and bars: More than 30 percent

Among those who will mark the holiday, 30.6 percent plan to hit up a bar or restaurant for a St. Paddy’s party, the NRF reports. Slightly more than that (32.9 percent) will prepare a special holiday-themed dinner, and 21.2 percent will decorate the home or office.

Rounding out the list of plans, 20.6 percent will attend a private party, and it’s safe to say that at a majority of those gatherings, someone (followed by everyone else) will break out into a spontaneous version of “Danny Boy.”

Americans of Irish ancestry: More than 34 million

They say everybody’s Irish on St. Patrick’s Day, and judging by the statistics, it’s perhaps not so much of a stretch. According to U.S. census figures, 34.1 million U.S. residents claim Irish ancestry. That’s more than seven times the population of Ireland itself (4.6 million).

And if you guessed Boston as America’s most Irish big city, then top o’ the mornin’ to ya: 24.1 percent of its residents — or more than 1.1 million — claim Irish ancestry, with Italians a distant second at 15 percent.

Date of the oldest St. Patrick’s parade: 1737

Boston is also home to the oldest St. Patrick’s Day parade, which first took place some 50 years before the ink had dried on the U.S. Constitution. It has attracted more than 800,000 parade-goers in years past, but that’s almost half of the turnout expected at the world’s largest St. Patrick’s Day parade.

You might think the largest parade would be in Dublin, Ireland (and indeed, their parade is part of a weeklong celebration). But the honor goes to New York City’s parade, which got its start in 1762 thanks to Irish soldiers in the British army. That parade attracts about 2 million attendees, and the route itself runs almost six hours, winding past St. Patrick’s Cathedral, which will receive an estimated 5.5 million visitors during the holiday.

Total beer tab: $255 million

When IbisWorld compiled St. Paddy’s beer consumption statistics in 2012, it forecast that brewers would rake in $245 million, or close to 1 percent of the annual take for a bar or liquor store. Since then, they’ve forecast annual growth for U.S. breweries at 2.1 percent, so it’s an educated guess to say that 2014 beer sales should top $255 million in the U.S.

Reliable estimates on how much green beer will be quaffed are much harder to come by, but DIY tips and recipes for making the stuff are more plentiful than three-leaf clovers. Assuming that the typical St. Patrick’s celebration is all about begorrah and less about bother, we hereby present one of the simplest recipes for green beer ever.

But it’s long on fun, as the grand marshal this year is Jim Belushi, and Mountain Man from “Duck Dynasty” is the official parade starter. What’s more, last year’s fete attracted 30,000 people, which averages out to about 306 people per foot.

It’s true: St. Patrick’s Day brings out the Irish in just about everyone. But it also honors a Catholic saint who, even though he wasn’t Irish himself, made huge cultural and religious contributions to the Emerald Isle. March 17 actually marks the date of Patrick’s passing in 461 A.D. So raise a glass, break the soda bread, wear the green, and join the parade.

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